General description
74. The crankshaft position sensor is mounted on an aluminum bracket and is attached to the front left of the timing chain cover. Partially it is located behind the antivibrator (see illustration). A four-pin connector with wiring connecting it to the ignition unit is attached to the sensor housing. The crankshaft position sensor, operating on a double Hall effect, contains two switches with one common magnet mounted between them. The magnet is separated from each of the switches by an air gap. The antivibrator is equipped with induction rings that provide a sequence of pulses "ON-OFF-ON", needed to set the timing of the ignition timing. Although for the direct ignition system circuit (DIS) and there is no procedure for setting the ignition timing, however, knowing the position of the crankshaft is also important for it. The sensor must not come into contact with the interruption rings: this may damage it, causing the engine to stall.
4.74. crankshaft position sensor (shown by arrow); for greater clarity, the anti-vibrator was removed from the engine
Examination
75. To check the performance of the crankshaft position sensor, you need a special device from General Motors (diagnostic computer Tech 1 N94-00101 A). Therefore, the sensor should be taken to a repair shop.
Replacement
76. Disconnect the wire from the negative battery terminal.
77. Remove the V-ribbed drive belt (see chapter 1, section 21).
78. Raise the car and securely fasten it on the racks.
79. After removing the right front wheel, remove the cover from the wing.
80. Disconnect the electrical connector from the crankshaft position sensor (see illustration).
4.80. Disconnect the electrical connector from the crankshaft position sensor (shown by arrow)
81. Having unscrewed the bolt, remove the crankshaft anti-vibrator (see chapter 2, part B, section 11).
82. Remove the protective screen of the crankshaft position sensor from the timing chain cover. When disconnecting the sensor using a lever or other sharp tool, be careful not to damage it.
83. Having unscrewed the bolts, disconnect the crankshaft sensor from the chain cover.
84. The sensor is installed in the reverse order.
Adjustment
85. Install the crankshaft sensor on the base, but do not fasten it.
86. Properly position the transducer with the base attached to the special tool (see illustration), on the timing chain cover.
4.86. Install the special adjuster on the base, but do not tighten the bolt: A - special tool J-37089, B - sensor, C - base, D - bolt, E - crankshaft
87. The second end of this device (see illustration) place on the crankshaft.
4.87. Slide the special tool J-37089 onto the crankshaft shank to install the sensor, and then tighten its mounting bolts
88. Attach base to cylinder block with bolts and torque to 30-35 ft-lbs.
89. After tightening the base clamp bolt to 30-35 ft-lbs, remove the special tool (J-37089).
90. Install the crankshaft position sensor shield.
91. After installing special tool J-37089 on the antivibrator, turn it very slowly (see illustration). If the tool touches the antivibrator in any place, replace the antivibrator with a new one.
4.91. Install the special tool on the antivibrator and check the induction rings for deflection or other damage: A - induction rings, B - J-37089 special tool, C - antivibrator
92. Install the anti-vibrator on the crankshaft.
93. Having screwed in the antivibrator mounting bolt, tighten it to the torque specified in the technical data in chapter 2, section 2.2.
94. The remaining operations for installing the crankshaft position sensor are performed in the reverse order.